| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | for [art] period | 941 |
|
| 2 | for a period | 518 |
|
| 3 | for a period | 517 |
|
| 4 | for the period | 422 |
|
| 5 | for the period | 422 |
|
